Today I got off the second head in record time without breaking any studs or anything similar.
Upon closer examination by my favorite machinist he found quite a lot of wear on the intake valve stems. Also the second head has a lot of guide wear so it will be new intakes and quite a few guides. Tomorrow he will grind the valves that are good and we'll see if any others need replacing for being bent.
I think maybe the air filters were loose on one or two of the carburators and let in dirty air.
I'll probably try to pull a piston and one rod tomorrow so he can measure the rings.
Ha! I'm sure glad that none of the valves were bent!
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.